In 1971, Canadian Johns-Manville Company staked the CC claims after locating a copper showing in diabase about 1 kilometre northeast of the confluence of Irish and Forster creeks. A follow-up geochemical survey in the vicinity indicated a small copper anomaly.

The fine-grained, dark greenish-grey diabase is thought to be a dike that strikes northeast and is estimated to be 15 metres wide. The dike intrudes siliceous greywacke and quartzite of the Middle Proterozoic Mount Nelson Formation (Purcell Supergroup).

Fine specks of chalcopyrite are present in carbonate-quartz veinlets. Less commonly, chalcopyrite occurs disseminated in the host rock or in the centre of carbonate-filled amygdules. Pyrite is common; bornite and pyrrhotite are rare. The diabase, generally massive, is marked by intense fracturing and heavy limonitic staining at the showing. The rock was blasted to a depth of 1.2 metres. A chip sample assayed 0.04 per cent copper (Assessment Report 3753). Leaching is evident and may account for the low yield.